Bar-bending machine



""oc't. 16, 192s.

s. MAcoMBgR BAB BENDING MACHINE Filed Sept)A 21. 1925 2 Sheets-Sheet 1 INVENToR.

Oct. 16, 1928. 1,687,776

S. MACOMBER BAR BENDING MACHINE .2 sheets-sheet 2 INVENTOR.

ATTORNEYS.

Patented Oct. 16, 1928.

UNITED STATES STANLEY MACOMBER, or MAssILLomoHIo, YAssIaNoitfTo.THE rNrAco1in3nRs COMPANY, or CANTON, omo,l A CORPORATION en -omo,

g A 1,687,776. PATENT OFFICE.

TEEL

BAR-BENDING MACHINE.

Application filed September 21, 1925. Serial No. 57,611.

Work as for example to form the web memv bers of structural'units such as the one knovvn in the trade as Massillon bar Joivst, such Joist being constructed by Welding or otherwise rigidly securing suchV a web member at `the CLB bends therein to parallel chord members.

1 The object of the invention is to provide a machine Whereon rods, even relatively heavy rods, maybe expeditiously bent into the desired zigzag form Without tearing or unduly cuttingat the bends which must be avoided if a rod is to be used as a structural element in a unit-.having predetermined load rating.` A further object is to form the bends accurately and of uniformly the same angular degree so that the resulting product may be assembled Without further manipulation inthe manufacture of composite structuralunits such "as the bar joist referred to above. v y

To the accomplishment ofthe foregoing and 'related ends, the invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims, 'thev annexed drawings and the following descrip`- tion setting forth in detail'certain mechanism embodying the invention, such disclosed .n K y as' a matter of convenience 1n construction,

means constituting, however, but oneof various mechanical forms in Which the principle of the invention may be used.

In said annexed drawings Fig. l is partly a side elevation and partly a longitudinal vertical section of a b ar bending machine `embodying my present improvements; Fig. 2 is a plan view of thesame; Fig.

. 3 is an end elevation thereof, as viewedfrom the left in Figs. l and 2; Figs. 4 and 5 represent diagrammatically successive operations in the bending of such a Web bar; and Fi g. 6 illustrates a section of the completed web bar.

The principal operative elements of the machine consist of tvvo aligned stationary blocks l and 2 that have V-shaped notches formed in their opposed faces and Will hereini after be called female swages, and a block 3 that is reciprocable between said blocks 1 and `2 and will hereinafter be called a male swage.

Said swages l and 2 are secured to support-V ing blocks 4L and 5, respectively,that are firmlyfboltedA to a table top 6,2shims APand 5a i being interposed between the sWages and their respective supporting blocksfwhereby the positionsof the4 female swages 1` and 2 may be adjusted. The male swage 3 is fitted between and securedto dogs 7 on a slide 8,-

y such dogs projectingthrough Aa longitudinal slot) in the table top and such slide 8 being mounted in guides 10 that lie Wholly beneath such table top. The upper surface ofthe latter, in other Words, isclear of all projections save for the female swages l and 2, theirsupporting blocks and the male swage 3.'

The driving mechanism Afor reciprocating the slide includes an eccentrioll ona suitable power driven shaftf12 and a connecting rod or pitman 13 connected at one end Witlrsueh eccentricand at the other end with a pin 14 on i the under side of the slide 8. The driving eccentric, it will thus be seen, is centered below 1 the centerline of'such slidewhich is a decided advantage in that the mot-ion 'of the slide departs from a simple-harmonic motion and becomes a slow steady one at the effective rod bending stage, with a more` rapid reversing motion until the next bending operation is A about tov begin.

The first female swage l is formed with a Y V-shaped notch l, While theother female.

swage is formed in its'upper portion Withv a V-shaped notch 2 and "in its lower portion' with a VV-shaped notch 2b of different angularlty. 4As shown in'. Fig. l', said swage 2 is,

separated in a horizontal planeinto two parts, the upper of Which is formed with Vthe notch or recess 2a-and the lovver with the-notch or recess 2b. The ends ofthe male swage that .pro]ectv toward the respective female swages are correspondingly pointed although not "on the same angle as are the recessesl 1*,'2f1and l2".

The machine as sho-Wn is V'filesigned to make bends of four different angles, namely,

degrees, 120 degrees, 45 degrees and 90 degrees. The'tirst two'belong to the same bar alWays,.While the latter two belong to one bar only. The male swages for these groupsv of bends Will havean angularity of 55 de-v grees andv degrees, respectively, it being noted that the angles used in the female swages are less than the angle to be retained ond group are 132 degrees and 88 degrees, respectively.v 'Y

To eliminate tearing and cutting the bars While they are being bent, the points of the male svvage are rounded, shown, at a raldius of not less than lith inch, and the sides of the female sivages should for the same rea- Vson be rounded at a radius of not less than be of heavy construction and Well braced to lli prevent Wracliing. The sivages will, of course, be desirably made oi hardened steel.

As shown in Fig. G, the i 'shed liar A. has its intermediate Vportieri reverseiy bent at points a at angles of 60 degree-s, While the end portion a of the bar, which extends in a direction parallel with the median line ot the zigzag main body of such bar, forms an angle oi' 120 degrees with the adjacent iveb portion. Fig. 1l represents the operation of the sivages in forming a bend at such point a, 'While-Fig. 5 similarly represents the operation in forming` the bend between lsuch portion a and adjacent web portion. For the purpose of making this last mentioned more obtuse bend, the lower notch 2b female `sWage jvvill beiemployed, While for forming the reversely directed angles at points a, notch 2 in such sWage and notch la in the op posed svvage Will be used. A stop 17 on the `'table top serves to gauge the rod A as it is -moved forwardly to permit the successive bends thus to be formed therein.

ther modes of applying the principle of my invention may be employed instead orr the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.` y Y y therefore particularlypoint out and dis -.tinctly rclaim as my invention vl. In mechanism l'or reversely bending barstoclr, the combinationoi asupport on the order oi a table top, tvvo female swages secured to saidv top,the latter having a slot eX- tending between said sivages, aslide mounted on the under side of said top so. as to be reciprocable longitudinally of such slot and Wholly beneath said top and a unitary male swage `mountr-id on said slide, the opposite ends oi' said male Vswage being formed to cooperate With saidV female swages, respecsWage being formed to Vcooperate withv said Aifemale swages, respectively. l

ln mechanism ttor reversely bending barsteclr, the combination of a support on the order oi a table top having a longitudinal slot therein, supporting blocks on said top adjacent the respective ends of such slot, a female swage adju-stably secured to the inwardly directed ace of each of said blocks, guides on the underside of said top parallel With such slot, a slide reciprocably heldin said guides, dogs on said slide projecting upwardly through such slot, and a male sivage removably held between ysaid ldogs,vthe opposite ends of ysaidmale'swage being Aformed to cooperate with said female svvages, respectively. 'A

@4. In mechanism for reversely bending bar-stock, the combination of a stationary female svvage having"tvvoV-shaped notches of different angularity one abovferthe other in its operative face, andv a male swage reciprocable towards and ironisaid female s'vvage and being pointed `to ent-'er thef notches `in said female svvage. Y i y I Signed by me this 18 day of Sept-,1925.

. sTANmiv` MA'ooMBnn 

